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JPS5456420

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DESCRIPTION JPS5456420
Description 1 and title of the invention Electroacoustic transducer diaphragm 11 = A diaphragm
for electroacoustic transducer which generates a sound wave by moving and characterized in
that a fine crack structure is formed in at least a part of the diaphragm plate. Diaphragm for
electroacoustic transducers. 2, fine cracks in at least a portion of the vibrating plate. In a
diaphragm for an electroacoustic transducer which has a structure and vibrates to generate
sound waves, an acoustic damping material is continuously filled in contact with the inside of the
crack structure and the surface of the structure. A diaphragm for an electroacoustic transducer
characterized by a groove.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a diaphragm for an
electric sound '5 sound transducer which prevents various resonance phenomena. In general, the
technology to suppress the resonance of structural members is to disperse the stress wave
propagating in the member, and to prevent the standing of the stress wave or to increase the
stress loss in the member to attenuate the stress wave. Although there are two types that prevent
resonance, there is also a conventional electro-acoustic transducer diaphragm that disperses
stress waves transmitted in the diaphragm by the damping holes provided in the diaphragm and
prevents standing of the stress waves There is an example (% open 5O-67130) which suppresses
the vibration of the diaphragm by making it. However, the damping hole is effective for the
longitudinal wave dispersion, but the shear wave. Scattering and damping of longitudinal and
transverse waves has no significant effect, so bending resonance is a diaphragm without damping
holes. There is a defect that occurs to the same extent. The object of the present invention is to
provide a diaphragm for an electroacoustic transducer which does not generate shear resonance,
bending resonance and spreading resonance without all the drawbacks of the prior art described
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above. するにある。 According to the present invention, a three-dimensionally extending meshlike crack structure is provided on a vibrating plate for an electroacoustic transducer, and a
stress wave propagating in the vibration plate is generated by the mesh-like crack structure 5. It
disperses in a three-dimensional manner to prevent the standing of stress waves, and by making
the cracks finer, the diaphragm changes. In forming a surface, a Coulomb friction is caused
between the crack surfaces to damp the stress wave and prevent the resonance. An embodiment
of a diaphragm for an electroacoustic transducer according to the present invention will be
described below with reference to the drawings. FIG. 1 is a perspective view showing the shape
of an electro-acoustic transducer diaphragm according to an embodiment of the present
invention. In the figure, 1- is a vibrating plate member, and 2 is a crack structure. FIG. Takes a
partial structure of the crack structure 2 shown in FIG. FIG. The unnecessary minute stress wave
which propagates the diaphragm by using the mesh-like fine crack structure of FIG. 2 and the
one member of the diaphragm of the electric sound IIl converter as shown in FIG. Disperse the
stress waves at the same time. Rubbing will further prevent resonance. . FIG. 5 is a structural
explanatory view showing a state in which the crack control structure 2 shown in FIG. 2 is filled
with a sound control material, and 3 is a 15 sound damping material. By filling in the sound
damping material 3 t-crack structure 2, it becomes possible to give a viscous effect to the threedimensionally spread mesh-like fine and scale-like structure 2, and as a result, By shifting the
phase of the stress wave, it is possible to prevent the standing wave of the stress wave as a whole
by 2.degree., Which helps to prevent the resonance.
FIG. 4 is a characteristic diagram in the case of measuring the on-axis sound pressure frequency
characteristic sound of the speaker as one embodiment, where actual Iw 4 is a characteristic
diagram of the speaker according to the present invention, broken? # A5 is a characteristic
diagram of a conventional speaker. Clear from the figure. As expected, according to the present
invention, the conventional speaker is raw. Resonance group, ie bending resonance component 6.
The vibration component 7 is suppressed, and the on-axis sound pressure frequency
characteristic. The mid region was flattened, and a straight falling portion was obtained. As is
apparent from the above description, according to the diaphragm for an electroacoustic
transducer according to the present invention, Not obtainable with conventional diaphragms and.
Since the flattening of the mid-range of the on-axis sound pressure frequency characteristics has
become possible 1), it is a great contribution to the technical field. いものかある。
4. Brief description of the drawings. FIG. 1 shows an embodiment of the electric flit converter
transducer excitation according to the present invention. -The perspective view shown, Fig. 2
does not show the structure of the cracked structure-partially enlarged Fig. 3 shows the state of
the second diaphragm structure in which the cracked structure shown in Fig. 2 is filled with an
acoustic damping material FIG. 4 is a graph showing sound pressure frequency characteristics on
a shelf of a speaker according to an embodiment of the diaphragm for an electroacoustic
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transducer according to the present invention. 1: Loudspeaker diaphragm 2: Crack structure 3:
Acoustic damping material 4: Characteristic diagram of the present invention (solid line) 5:
Characteristic diagram of conventional example (broken) Agent patent attorney thin 1) Toshiyuki,
1 st m 2 喝 EndPage: 2
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